Oberon/V2/Oberon

MODULE Oberon; (*JG 6.9.90*) IMPORT Kernel, Modules, Input, Display, Fonts, Viewers, Texts; CONST consume* = 0; track* = 1; (*input message id*) defocus* = 0; neutralize* = 1; mark* = 2; (*control message id*) BasicCycle = 20; ESC = 1BX; SETUP = 0A4X; TYPE Painter* = PROCEDURE (x, y: INTEGER); Marker* = RECORD Fade*, Draw*: Painter END; Cursor* = RECORD marker*: Marker; on*: BOOLEAN; X*, Y*: INTEGER END; ParList* = POINTER TO ParRec; ParRec* = RECORD vwr*: Viewers.Viewer; frame*: Display.Frame; text*: Texts.Text; pos*: LONGINT END; InputMsg* = RECORD (Display.FrameMsg) id*: INTEGER; keys*: SET; X*, Y*: INTEGER; ch*: CHAR; fnt*: Fonts.Font; col*, voff*: SHORTINT END; SelectionMsg* = RECORD (Display.FrameMsg) time*: LONGINT; text*: Texts.Text; beg*, end*: LONGINT END; ControlMsg* = RECORD (Display.FrameMsg) id*, X*, Y*: INTEGER END; CopyOverMsg* = RECORD (Display.FrameMsg) text*: Texts.Text; beg*, end*: LONGINT END; CopyMsg* = RECORD (Display.FrameMsg) F*: Display.Frame END; Task* = POINTER TO TaskDesc; TaskDesc* = RECORD next: Task; safe*: BOOLEAN; handle*: PROCEDURE END; VAR User*: ARRAY 8 OF CHAR; Password*: LONGINT; Arrow*, Star*: Marker; Mouse*, Pointer*: Cursor; FocusViewer*: Viewers.Viewer; Log*: Texts.Text; Par*: ParList; (*actual parameters*) CurTask*, PrevTask: Task; CurFnt*: Fonts.Font; CurCol*, CurOff*: SHORTINT; DW, DH, CL, H0, H1, H2, H3: INTEGER; ActCnt: INTEGER; (*action count for GC*) Mod: Modules.Module; PROCEDURE Min (i, j: INTEGER): INTEGER; BEGIN IF i <= j THEN RETURN i ELSE RETURN j END END Min; (*user identification*) PROCEDURE Code(VAR s: ARRAY OF CHAR): LONGINT; VAR i: INTEGER; a, b, c: LONGINT; BEGIN a := 0; b := 0; i := 0; WHILE s[i] # 0X DO 			c := b; b := a; a := (c MOD 509 + 1) * 127 + ORD(s[i]); INC(i) END; IF b >= 32768 THEN b := b - 65536 END; RETURN b * 65536 + a 	END Code; PROCEDURE SetUser* (VAR user, password: ARRAY OF CHAR); BEGIN COPY(user, User); Password := Code(password) END SetUser; (*clocks*) PROCEDURE GetClock* (VAR t, d: LONGINT); BEGIN Kernel.GetClock(t, d) 	END GetClock; PROCEDURE SetClock* (t, d: LONGINT); BEGIN Kernel.SetClock(t, d) 	END SetClock; PROCEDURE Time* : LONGINT; BEGIN RETURN Input.Time END Time; (*cursor handling*) PROCEDURE* FlipArrow (X, Y: INTEGER); BEGIN IF X < CL THEN IF X > DW - 15 THEN X := DW - 15 END ELSE IF X > CL + DW - 15 THEN X := CL + DW - 15 END END; IF Y < 15 THEN Y := 15 ELSIF Y > DH THEN Y := DH END; Display.CopyPattern(Display.white, Display.arrow, X, Y - 15, 2) END FlipArrow; PROCEDURE* FlipStar (X, Y: INTEGER); BEGIN IF X < CL THEN IF X < 7 THEN X := 7 ELSIF X > DW - 8 THEN X := DW - 8 END ELSE IF X < CL + 7 THEN X := CL + 7 ELSIF X > CL + DW - 8 THEN X := CL + DW – 8 END END ; IF Y < 7 THEN Y := 7 ELSIF Y > DH - 8 THEN Y := DH - 8 END; Display.CopyPattern(Display.white, Display.star, X - 7, Y - 7, 2) END FlipStar; PROCEDURE OpenCursor* (VAR c: Cursor); BEGIN c.on := FALSE; c.X := 0; c.Y := 0 END OpenCursor; PROCEDURE FadeCursor* (VAR c: Cursor); BEGIN IF c.on THEN c.marker.Fade(c.X, c.Y); c.on := FALSE END END FadeCursor; PROCEDURE DrawCursor* (VAR c: Cursor; VAR m: Marker; X, Y: INTEGER); BEGIN IF c.on & ((X # c.X) OR (Y # c.Y) OR (m.Draw # c.marker.Draw)) THEN c.marker.Fade(c.X, c.Y); c.on := FALSE END; IF ~c.on THEN m.Draw(X, Y); c.marker := m; c.X := X; c.Y := Y; c.on := TRUE END END DrawCursor; (*display management*) PROCEDURE RemoveMarks* (X, Y, W, H: INTEGER); BEGIN IF (Mouse.X > X - 16) & (Mouse.X < X + W + 16) & (Mouse.Y > Y - 16) & (Mouse.Y < Y + H + 16) THEN FadeCursor(Mouse) END; IF (Pointer.X > X - 8) & (Pointer.X < X + W + 8) & (Pointer.Y > Y - 8) & (Pointer.Y < Y + H + 8) THEN FadeCursor(Pointer) END END RemoveMarks; PROCEDURE* HandleFiller (V: Display.Frame; VAR M: Display.FrameMsg); BEGIN WITH V: Viewers.Viewer DO 			IF M IS InputMsg THEN WITH M: InputMsg DO 					IF M.id = track THEN DrawCursor(Mouse, Arrow, M.X, M.Y) END END; ELSIF M IS ControlMsg THEN WITH M: ControlMsg DO 					IF M.id = mark THEN DrawCursor(Pointer, Star, M.X, M.Y) END END ELSIF M IS Viewers.ViewerMsg THEN WITH M: Viewers.ViewerMsg DO 					IF (M.id = Viewers.restore) & (V.W > 0) & (V.H > 0) THEN RemoveMarks(V.X, V.Y, V.W, V.H); Display.ReplConst(Display.black, V.X, V.Y, V.W, V.H, 0) ELSIF (M.id = Viewers.modify) & (M.Y < V.Y) THEN RemoveMarks(V.X, M.Y, V.W, V.Y - M.Y); Display.ReplConst(Display.black, V.X, M.Y, V.W, V.Y - M.Y, 0) END END END END END HandleFiller; PROCEDURE OpenDisplay* (UW, SW, H: INTEGER); VAR Filler: Viewers.Viewer; BEGIN Input.SetMouseLimits(Viewers.curW + UW + SW, H); Display.ReplConst(Display.black, Viewers.curW, 0, UW + SW, H, 0); NEW(Filler); Filler.handle := HandleFiller; Viewers.InitTrack(UW, H, Filler); (*init user track*) NEW(Filler); Filler.handle := HandleFiller; Viewers.InitTrack(SW, H, Filler) (*init system track*) END OpenDisplay; PROCEDURE DisplayWidth* (X: INTEGER): INTEGER; BEGIN RETURN DW 	END DisplayWidth; PROCEDURE DisplayHeight* (X: INTEGER): INTEGER; BEGIN RETURN DH 	END DisplayHeight; PROCEDURE OpenTrack* (X, W: INTEGER); VAR Filler: Viewers.Viewer; BEGIN NEW(Filler); Filler.handle := HandleFiller; Viewers.OpenTrack(X, W, Filler) END OpenTrack; PROCEDURE UserTrack* (X: INTEGER): INTEGER; BEGIN RETURN X DIV DW * DW 	END UserTrack; PROCEDURE SystemTrack* (X: INTEGER): INTEGER; BEGIN RETURN X DIV DW * DW + DW DIV 8 * 5 END SystemTrack; PROCEDURE UY (X: INTEGER): INTEGER; VAR fil, bot, alt, max: Display.Frame; BEGIN Viewers.Locate(X, 0, fil, bot, alt, max); IF fil.H >= DH DIV 8 THEN RETURN DH END; RETURN max.Y + max.H DIV 2 END UY; PROCEDURE AllocateUserViewer* (DX: INTEGER; VAR X, Y: INTEGER); BEGIN IF Pointer.on THEN X := Pointer.X; Y := Pointer.Y 		ELSE X := DX DIV DW * DW; Y := UY(X) END END AllocateUserViewer; PROCEDURE SY (X: INTEGER): INTEGER; VAR fil, bot, alt, max: Display.Frame; BEGIN Viewers.Locate(X, DH, fil, bot, alt, max); IF fil.H >= DH DIV 8 THEN RETURN DH END; IF max.H >= DH - H0 THEN RETURN max.Y + H3 END; IF max.H >= H3 - H0 THEN RETURN max.Y + H2 END; IF max.H >= H2 - H0 THEN RETURN max.Y + H1 END; IF max # bot THEN RETURN max.Y + max.H DIV 2 END; IF bot.H >= H1 THEN RETURN bot.H DIV 2 END; RETURN alt.Y + alt.H DIV 2 END SY; PROCEDURE AllocateSystemViewer* (DX: INTEGER; VAR X, Y: INTEGER); BEGIN IF Pointer.on THEN X := Pointer.X; Y := Pointer.Y 			ELSE X := DX DIV DW * DW + DW DIV 8 * 5; Y := SY(X) END END AllocateSystemViewer; PROCEDURE MarkedViewer* : Viewers.Viewer; BEGIN RETURN Viewers.This(Pointer.X, Pointer.Y) 	END MarkedViewer; PROCEDURE PassFocus* (V: Viewers.Viewer); VAR M: ControlMsg; BEGIN M.id := defocus; FocusViewer.handle(FocusViewer, M); FocusViewer := V 	END PassFocus; (*command interpretation*) PROCEDURE Call* (VAR name: ARRAY OF CHAR; par: ParList; new: BOOLEAN; 		VAR res: INTEGER); VAR Mod: Modules.Module; P: Modules.Command; i, j: INTEGER; BEGIN res := 1; i := 0; j := 0; WHILE name[j] # 0X DO IF name[j] = "." THEN i := j END; INC(j) END; IF i > 0 THEN name[i] := 0X; IF new THEN Modules.Free(name, FALSE) END; Mod := Modules.ThisMod(name); IF Modules.res = 0 THEN INC(i); j := i; 				WHILE name[j] # 0X DO name[j - i] := name[j]; INC(j) END; name[j - i] := 0X; P := Modules.ThisCommand(Mod, name); IF Modules.res = 0 THEN Par := par; Par.vwr := Viewers.This(par.frame.X, par.frame.Y); P; res := 0 END ELSE res := Modules.res END END END Call; PROCEDURE GetSelection* (VAR text: Texts.Text; VAR beg, end, time: LONGINT); VAR M: SelectionMsg; BEGIN M.time := -1; Viewers.Broadcast(M); text := M.text; beg := M.beg; end := M.end; time := M.time END GetSelection; PROCEDURE* GC; VAR x: LONGINT; BEGIN IF ActCnt <= 0 THEN Kernel.GC; ActCnt := BasicCycle END END GC; PROCEDURE Install* (T: Task); VAR t: Task; BEGIN t := PrevTask; WHILE (t.next # PrevTask) & (t.next # T) DO t := t.next END; IF t.next = PrevTask THEN T.next := PrevTask; t.next := T END END Install; PROCEDURE Remove* (T: Task); VAR t: Task; BEGIN t := PrevTask; WHILE (t.next # T) & (t.next # PrevTask) DO t := t.next END; IF t.next = T THEN t.next := t.next.next; PrevTask := t.next END; IF CurTask = T THEN CurTask := PrevTask.next END END Remove; PROCEDURE Collect* (count: INTEGER); BEGIN ActCnt := count END Collect; PROCEDURE SetFont* (fnt: Fonts.Font); BEGIN CurFnt := fnt END SetFont; PROCEDURE SetColor* (col: SHORTINT); BEGIN CurCol := col END SetColor; PROCEDURE SetOffset* (voff: SHORTINT); BEGIN CurOff := voff END SetOffset; PROCEDURE Loop*; VAR V: Viewers.Viewer; M: InputMsg; N: ControlMsg; prevX, prevY, X, Y: INTEGER; keys: SET; ch: CHAR; BEGIN LOOP Input.Mouse(keys, X, Y); IF Input.Available > 0 THEN Input.Read(ch); IF ch < 0F0X THEN IF ch = ESC THEN N.id := neutralize; Viewers.Broadcast(N); FadeCursor(Pointer) ELSIF ch = SETUP THEN N.id := mark; N.X := X; N.Y := Y; V := Viewers.This(X, Y); V.handle(V, N) 					ELSE IF ch < " " THEN IF ch = 1X THEN ch := 83X (*ƒ*) ELSIF ch = 0FX THEN ch := 84X (*„*) ELSIF ch = 15X THEN ch := 85X (*...*) END ELSIF ch > "~" THEN IF ch = 81X THEN ch := 80X (*€*) ELSIF ch = 8FX THEN ch := 81X (* *) ELSIF ch = 95X THEN ch := 82X (*‚*) END END; M.id := consume; M.ch := ch; M.fnt := CurFnt; M.col := CurCol; M.voff := CurOff; FocusViewer.handle(FocusViewer, M); DEC(ActCnt) END ELSIF ch = 0F1X THEN Display.SetMode(0, {}) (*on*) ELSIF ch = 0F2X THEN Display.SetMode(0, {0}) (*off*) ELSIF ch = 0F3X THEN Display.SetMode(0, {2}) (*inv*) END ELSIF keys # {} THEN M.id := track; M.X := X; M.Y := Y; M.keys := keys; REPEAT V := Viewers.This(M.X, M.Y); V.handle(V, M); Input.Mouse(M.keys, M.X, M.Y) 				UNTIL M.keys = {}; DEC(ActCnt) ELSE IF (X # prevX) OR (Y # prevY) OR ~Mouse.on THEN M.id := track; M.X := X; M.Y := Y; M.keys := keys; V := Viewers.This(X, Y); V.handle(V, M); prevX := X; prevY := Y 				END; CurTask := PrevTask.next; IF ~CurTask.safe THEN PrevTask.next := CurTask.next END; CurTask.handle; PrevTask.next := CurTask; PrevTask := CurTask END END END Loop; BEGIN User[0] := 0X; Arrow.Fade := FlipArrow; Arrow.Draw := FlipArrow; Star.Fade := FlipStar; Star.Draw := FlipStar; OpenCursor(Mouse); OpenCursor(Pointer); DW := Display.Width; DH := Display.Height; CL := Display.ColLeft; H3 := DH - DH DIV 3; H2 := H3 - H3 DIV 2; H1 := DH DIV 5; H0 := DH DIV 10; OpenDisplay(DW DIV 8 * 5, DW DIV 8 * 3, DH); FocusViewer := Viewers.This(0, 0); CurFnt := Fonts.Default; CurCol := Display.white; CurOff := 0; Collect(BasicCycle); NEW(PrevTask); PrevTask.handle := GC; PrevTask.safe := TRUE; PrevTask.next := PrevTask; Mod := Modules.ThisMod("System"); Display.SetMode(0, {}) END Oberon.